[Python-Dev] datetime module enhancements (original) (raw)

Steven Bethard steven.bethard at gmail.com
Mon Mar 12 00:41:47 CET 2007

On 3/11/07, BJörn Lindqvist <bjourne at gmail.com> wrote:

I do not really understand proper temporal intervals. But I am interested what "temporal interval logic" has to say about this problem:

def getmostrecentarticles(articles, cutoffdate): recentarticles = [] for article in articles: if article.datetimeposted > cutoffdate: recentarticles.append(article) return recentarticles

Thanks for being concrete here. =)

Would temporal interval logic make it so an article with datetime(2007, 1, 1, 0, 0, 0) be included, if cutoffdate was date(2007, 1, 1)?

No, datetime(2007, 1, 1, 0, 0, 0) is not after date(2007, 1, 1), it is included within it. If you want an article with that datetime to be included, you should be comparing against datetime(2006, 12, 31, 23, 59, 59) or date(2006, 12, 31).

What about articles with datetimes (2007, 1, 1, 0, 0, 1)

No. For the same reason as above.

and (2007, 1, 2, 0, 0, 0) respectively?

Yes.

I believe that "temporal interval logic" has to include at least the last two examples in recentarticles, otherwise it would be highly annoying.

Could you elaborate? Right now, to get the results you want with your code, you have to compare against datetime(2006, 12, 31, 23, 59, 59). How is comparing against date(2006, 12, 31) any worse?

Steve

I'm not in-sane. Indeed, I am so far out of sane that you appear a tiny blip on the distant coast of sanity. --- Bucky Katt, Get Fuzzy

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